Dresden 2020 – scientific programme

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DS: Fachverband Dünne Schichten

DS 45: Thin Film Properties: Structure, Morphology and Composition III

DS 45.2: Talk

Friday, March 20, 2020, 09:45–10:00, CHE 89

From colloidal Cu2ZnSnS4 (CZTS) nanocrystals to highly conductive p-type thin films — •Oleksandr Selyshchev¹, Alexandra Raevskaya¹, Volodymyr Dzhagan^2,3, Serhiy Kondratenko³, and Dietrich R.T. Zahn¹ — ¹Semiconductor Physics, Chemnitz University of Technology, D-09107 Chemnitz, Germany — ²Institute of Semiconductor Physics, Nat. Acad. Sci. of Ukraine, 03028 Kyiv, Ukraine — ³Department of Physics, Taras Shevchenko National University of Kyiv, 01601 Kyiv, Ukraine

CZTS is object of intensive research due to its perspectives in light harvesting applications. The benefits of the material are the direct tunable bandgap (1.5-2.0 eV), the high absorption coefficient, and the earth abundance and low toxicity of the constituents. In the focus of our research are aqueous colloidal CZTS nanocrystals (NCs) prepared in a green way. Details on the synthesis and spectral characteristics can be found in ref. [1]. Here we report on 50-100 nm thin CZTS films prepared by spin coating of a CZTS NC ink (a concentrated colloidal solution of CZTS NCs) on glass substrates. The conductivity of the films reaches 250 S/cm (300 K). The p-type conductivity is evident from the non-zero density of states at the Fermi edge in the X-ray photoemission spectra (XPS). The kesterite crystal structure of the material was confirmed by Raman spectroscopy. Composition and chemical states of the elements on the surface were examined by XPS. The optical absorption/reflection were studied in the visible, near-, and middle-infrared ranges. [1] Stroyuk et al., Sci Rep,(2018)8,13677, DOI:10.1038/s41598-018-32004-1.